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Compressor History
68
Increase Bronze Bearing Bore
Diameter in Oil Pump Housing
In the first quarter of 2005 the bronze bearing
bore diameter in oil pump housings was increased
to 0.7502 to 0.7507 in. (19.0551 to 19.0678 mm).
Before that the bronze bearing bore diameter was
0.7497 to 0.7502 (19.0424 to 19.0551 mm).
Improve Heat Treating on Oil Pump
Shaft
In the first quarter of 2005 an improved process to
heat treat the oil pump shafts was implemented.
HPCO Switch with Straight Threads
In the second quarter of 2006 an HPCO switch
with straight threads and a copper sealing washer
was introduced in Super II units.
The HPCO with straight threads is P/N 41-6356.
The copper sealing washer is P/N 33-4277.
NOTE: The HPCO with straight threads is not
interchangeable with the HPCO with 1/8 in.
NPT (P/N 41-3669). Make sure to use the correct
type when replacing an HPCO.
C5 Crankshaft Drive End Bearing
and Cast Iron Oil Pump Housing
In the second quarter of 2007 the use of a C5
crankshaft drive end bearing and cast iron oil
pump housing is being implemented. The cast
iron oil pump housing is painted black. Therefore,
a compressor with a C5 bearing can be identified
by the black oil pump housing. See “Compressor
Model Identification” on page 11 for more
information about identifying compressor models.
A compressor with a C5 bearing and a cast iron
oil pump housing requires special tools and
procedures to remove and install the crankshaft.
See “Crankshaft” on page 54.
Oil Collection Container
The oil collection container was added to trailer
units starting in the first quarter of 2010. The oil
collection container collects the compressor shaft
seal seepage to keep the unit clean. See “Oil
Collection Container” on page 14 for more
information.
Check Valve in Oil Collection
Container
A check valve was added Oil Collection
Container in November 2012 to improve the shaft
seal reliability by ensuring oil stays on the shaft
seal when the suction pressure is in a vacuum. See
“Oil Collection Container” on page 14 for more
information.
NOTE: The check valve is no longer required on
Pressurized Seal Cavity Compressors.
Pressurized Seal Cavity
Starting in the first quarter of 2014 a pressurized
seal cavity was phased into use on large shaft four
cylinder compressors. Compressors with a
pressurized seal cavity can be identified by the
“P” on the seal cover. See “Compressor Model
Identification” on page 11 for more information
about identifying compressor models.
Internal Oil Filter
Starting in the first quarter of 2014 four cylinder
compressors with an internal oil filter were phased
into truck and trailer units that typically use
compressors with external oil filters.